title: Effects of cadmium on enzymatic and non-enzymatic antioxidative defences of rice (Oryza sativa L.).
abstract: The effects of 60-d cadmium (Cd) exposure on enzymatic and non-enzymatic antioxidative system of Oryza sativa L. seedlings at tillering stage were studied using soil culture experiment. Research findings showed that chlorophyll content of Oryza sativa L. declined with the increase in soil metal concentration. Cd pollution induced the antioxidant stress by inducing O2(-1) and H2O2, which increased in plants; at the same time, MDA as the final product of peroxidation of membrane lipids, accumulated in plant. The antioxidant enzyme system was initiated under the Cd exposure, i.e. almost all the activities of superoxide dismutase (SOD), peroxidase, catalase, glutathione peroxidase, and ascorbate peroxidase were elevated both in leaves and roots. The non-protein thiols including phytochelatins and glutathione to scavenge toxic free radicals caused by Cd stress was also studied. The contents of phytochelatins and glutathione were about 3.12-6.65-fold and 3.27-10.73-fold in leaves, against control; and the corresponding values were about 3.53-9.37-fold and 1.41-5.11-fold in roots, accordingly.
authors.affiliation: College of Resource and Environment, Guangxi Normal University, Guilin, China.
authors.forename: Fangming
authors.initials: F
authors.lastname: Yu
authors.forename: Kehui
authors.initials: K
authors.lastname: Liu
authors.forename: Mingshun
authors.initials: M
authors.lastname: Li
authors.forename: Zhenming
authors.initials: Z
authors.lastname: Zhou
authors.forename: Hua
authors.initials: H
authors.lastname: Deng
authors.forename: Bin
authors.initials: B
authors.lastname: Chen
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D002104:Cadmium / Q000032:analysis / Q000378:metabolism / Q000633:toxicity*; D002374:Catalase / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D005978:Glutathione / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D008315:Malondialdehyde / Q000378:metabolism; D012275:Oryza / Q000187:drug effects* / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism; D018384:Oxidative Stress / Q000502:physiology*; D054811:Phytochelatins / Q000378:metabolism; D018515:Plant Leaves / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development / Q000502:physiology; D018517:Plant Roots / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development / Q000502:physiology; D011897:Random Allocation; D036226:Seedlings / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development / Q000502:physiology; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism / Q000633:toxicity*; D013482:Superoxide Dismutase / Q000378:metabolism; D013481:Superoxides / Q000378:metabolism
chemical_list: D000975:Antioxidants; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D013481:Superoxides; D002734:Chlorophyll; D008315:Malondialdehyde; D054811:Phytochelatins; D006861:Hydrogen Peroxide; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D005978:Glutathione